CN113210838A - Box sealing circumferential weld repair welding method based on back-pumping friction stir welding process - Google Patents
Box sealing circumferential weld repair welding method based on back-pumping friction stir welding process Download PDFInfo
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- CN113210838A CN113210838A CN202110650996.0A CN202110650996A CN113210838A CN 113210838 A CN113210838 A CN 113210838A CN 202110650996 A CN202110650996 A CN 202110650996A CN 113210838 A CN113210838 A CN 113210838A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
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Abstract
The invention provides a box sealing circumferential weld repair welding method based on a pumpback friction stir welding process, which is characterized in that a product to be repaired welded is assembled on circumferential weld friction stir welding equipment through a repair welding tool; the repair welding tool comprises a mandrel, a central rod, a support block, a base plate and a support rod, after assembly, the clamped product is fixed on the mandrel of the circumferential weld friction stir welding equipment through the mandrel of the repair welding tool, and the base plate of the tightening member is used for tightening a welding seam needing repair welding at the inner wall of the product to be welded; and after repair welding, the repair welding tool and the repair welded product are detached, and a mandrel of the repair welding tool is detached from a mandrel of the circular seam friction stir welding equipment. The method is simple to operate, reliable in repair welding mode, low in production cost and capable of achieving double improvement of quality and benefit for the production and manufacturing industry.
Description
Technical Field
The invention belongs to the technical field of circumferential weld friction stir welding repair welding devices, and particularly relates to a box sealing circumferential weld repair welding method based on a back suction friction stir welding process.
Background
With the continuous development of the demand of aerospace missions in China, the thrust-weight ratio, the effective load and the like of aerospace craft are continuously improved, structural members of aerospace craft represented by rocket fuel storage tanks are developed in the directions of large diameter, heavy load, long-term storage service and the like, and higher requirements are provided for structural lightweight and reliability. Friction Stir Welding (FSW), a good quality and high efficiency solid phase joining method, has become a major technology in the manufacture of storage tanks. At present, the tunnel hole defect of the friction stir welding circumferential weld of the storage tank cannot be fundamentally eliminated, the repair welding technical means is not mature enough, the quality and the efficiency improve the space, and the defects are mainly reflected in the following 2 aspects:
1. poor quality of welding repair welding seam
When the defects exceed the standard according to the requirement of the rocket storage box production file, local or full-length repair welding is allowed under the condition of friction stir welding repair welding; in the absence of friction stir weld repair welding, it is accepted by design to allow for localized application of fusion weld repair welding. At present, box sealing friction stir welding does not have local friction stir welding capacity, local point intermittent defects agree to adopt a repair welding means of fusion welding digging and draining repair welding through design, tensile strength of a welding seam is reduced to 260-280 MP base plates from 300-340 MP base plates after one-time repair welding is qualified, mechanical property is reduced by about 15%, and reliability of the welding seam is greatly influenced. And the 2219 material friction stir welding is relatively poor in weld compactness after being finished compared with the base metal, and is easy to generate defects such as air holes and cracks to cause repeated repair welding, so that the risk is high.
2. Repair welding of local friction stir welding cannot be carried out due to continuity defects of box sealing welding seams
At present, after the last girth welding of the storage box is finished, if the detachable inner support front phased array is detached, the defect of long continuity is not detected, the product is a closed storage box, the detachable inner support structure is complex, the weight is more than 1T, the detachable inner support piston ring cannot be hoisted to the inside of the box body again, the condition of using the pumping-back friction stir welding repair welding is not provided, the last girth welding needs to be decomposed, the friction stir welding is used for re-welding, the method has large process risk, more metal materials are lost in the repair process, the length of a final product is ultra-poor, and the problem of new friction stir welding defects appears again after the repair welding is solved, so that great economic loss is caused for a factory.
Although the plug repair welding is specially designed for the friction stir welding seam with a complex repair welding structure, most friction stir welding equipment used in the current factory does not have the plug repair welding function, the plug repair welding process is not mature enough, the application is difficult, and the cost of the modified equipment is high.
Disclosure of Invention
Based on the problems, the invention aims to provide a box sealing circumferential weld repair welding method based on a back-pumping friction stir welding process.
In order to achieve the above purpose, the invention adopts the technical scheme that: a box sealing circumferential weld repair welding method based on a back-pumping friction stir welding process comprises the following steps:
step 1: assembling a product to be subjected to repair welding on annular seam friction stir welding equipment through a repair welding tool;
the repair welding tool comprises a mandrel, central rods, supporting blocks, a base plate and supporting rods, wherein the two central rods form a rod group, the inner end of the rod group is connected with the mandrel, one end of each supporting block is connected with the outer end of the rod group, and the other end of each supporting block is connected with the base plate through a connector to form a tensioning member; the plurality of bracing members are circumferentially arranged relative to the mandrel to form a disc-shaped inner bracing ring matched with the interior of a product to be repaired, and two ends of each bracing rod are respectively connected with two adjacent bracing blocks;
after assembly, the clamped product is fixed on a core shaft of circular seam friction stir welding equipment through a core shaft of a repair welding tool, and an adapter is adjusted to enable a base plate of a tightening member in an inner support ring to tighten a welding seam to be repaired and welded on the inner wall of the product to be welded;
step 2: repair welding;
starting circular seam friction stir welding equipment, and performing repair welding on a welding seam tightly supported by a backing plate by using a stirring pin on the equipment;
and step 3: demolishing repair welding product
And (4) removing the repair welding tool from the product after repair welding, removing a core shaft of the repair welding tool from a core shaft of the circular seam friction stir welding equipment, withdrawing the core shaft of the equipment, and removing the product after repair welding from the circular seam friction stir welding equipment to finish repair welding.
Specifically, the adapter comprises an adapter seat, a screw rod and nuts, the adapter seat is fixed at one end, close to the support block, of the backing plate through a screw, one end of the screw rod is connected with the adapter seat, the other end of the screw rod penetrates through the support block, and the two nuts are respectively located at two ends of the support block and are in threaded connection with the screw rod; in the step 1, the screw is rotated to drive the base plate to be away from the supporting block, and the welding line needing repair welding at the inner wall of a product to be welded is tightly supported while the distance between the base plate and the supporting block is increased; in the step 3, after repair welding, the nut is rotated to enable the screw to drive the base plate to be close to the support block, the distance between the base plate and the support block is reduced, meanwhile, a weld joint at the position of the inner wall of a product to be welded is loosened after repair welding, the support member and the support rod are removed, then the product is taken out from a box body after repair welding, and finally, the core shaft of the repair welding tool is detached from the equipment core shaft; the screw rod drives the backing plate to be close to or far away from the supporting block, so that the distance between the backing plate and the supporting block is increased or decreased, and the backing plate is convenient to adapt to repair welding of circumferential welds with different inner diameters.
Further, the backing plate is connected with the bracer through three adaptor, and the structure that backing plate and bracer are connected to three adaptor is more stable, and support performance is good, and when the inside screw hole of adaptor damaged, the problem that the unable installation of screw thread damage screw rod just can be solved to the change adaptor, avoids repair welding frock to reprocess on a large scale.
Specifically, four groups of supporting members are uniformly distributed in sequence relative to the circumferential direction of the mandrel to form a disc-shaped inner supporting ring.
Specifically, a sleeve ring is fixedly arranged outside the mandrel, a T-shaped slot is formed in the sleeve ring, the T-shaped slot axially extends to the end part penetrating through the sleeve ring, the inner end of the central rod is matched with the T-shaped slot, and in the step 1, the inner end of the central rod is inserted into the T-shaped slot from the end part of the sleeve ring so as to connect the tensioning member with the mandrel; and (3) after the repair welding in the step (3) is finished, detaching the central rod from the end part of the lantern ring, namely separating the central rod from the mandrel.
Specifically, the mandrel is externally provided with an upper lantern ring and a lower lantern ring, T-shaped slots in the upper lantern ring and the lower lantern ring respectively axially extend to the upper end and the lower end of the lantern ring, one cushion block in the tightening member is respectively connected with the upper rod group and the lower rod group, and central rods of the upper rod group and the lower rod group are respectively matched with the T-shaped slots in the upper lantern ring and the lower lantern ring.
Specifically, the outer end of the center rod is in threaded connection with the supporting block.
The invention has the beneficial effects that:
according to the method for performing the box sealing circumferential weld repair welding based on the pumpback friction stir welding process, provided by the invention, under the condition that equipment does not have a plug repair welding function, the assembly can be performed in a storage box which is subjected to box sealing assembly welding, a defect area is tightly propped, the pumpback repair welding of the box sealing welding seam is realized, according to the technical level of the current friction stir welding development, the pumpback repair welding process is mature, new investment or modification of friction stir welding circumferential weld equipment is not needed, the pumpback repair welding process method after box sealing is realized more reliable, the investment cost is lower, the operation is simple, the repair welding mode is reliable, the repair welding performance is far higher than that of fusion welding repair welding, the production cost is greatly reduced, and the quality and benefit can be improved for the production and manufacturing industry.
Drawings
FIG. 1 is a top view after assembly;
FIG. 2 is a schematic view; a top view of the mandrel;
FIG. 3 is a sectional view taken along line A-A in FIG. 2;
FIG. 4 is a partial schematic view of the tightening member;
FIG. 5 is a schematic view of an adapter;
wherein, 1 is the dabber, 2 is well core rod, 3 is the kickstand, 4 is the backing plate, 5 is the vaulting pole, 6 is the adapter, 7 is the screw rod, 8 is the nut, 9 is the lantern ring, 10 is T shape slot.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Examples
As shown in fig. 1, the embodiment provides a repair welding method for a box sealing circumferential weld based on a back-drawing friction stir welding process, which includes the following steps:
step 1: assembling a storage tank to be subjected to repair welding on circular seam friction stir welding equipment through a repair welding tool;
the repair welding tool comprises a mandrel 1, a central rod 2, a supporting block 3, a base plate 4 and a supporting rod 5, as shown in fig. 2, a sleeve ring 9 is fixedly arranged outside the mandrel 1, a T-shaped slot 10 is arranged on the sleeve ring 9, and the T-shaped slot 10 axially extends to the end part penetrating through the sleeve ring 9; the two central rods 2 form a rod group, the inner end of the rod group is connected with the mandrel 1, one end of the supporting block 3 is in threaded connection with the outer end of the rod group, and the other end of the supporting block is connected with the backing plate 4 through three adapter pieces to form a tensioning member; four groups of supporting members are uniformly distributed in the circumferential direction relative to the mandrel 1 to form a disc-shaped inner supporting ring, and two ends of a 4-supporting rod 5 are respectively connected with two adjacent supporting blocks 3; as shown in fig. 3, in this embodiment, an upper sleeve ring 9 and a lower sleeve ring 9 are arranged outside a mandrel 1, T-shaped slots on the upper sleeve ring and the lower sleeve ring respectively extend axially to the upper end and the lower end of the sleeve ring, one cushion block 3 in a tightening member is respectively connected with the upper rod group and the lower rod group, and a central rod 2 of the upper rod group and the lower rod group is respectively adapted to the T-shaped slots 10 on the upper sleeve ring and the lower sleeve ring; as shown in fig. 4 and 5, the adaptor includes an adaptor 6, a screw 7, and nuts 8, the adaptor 6 is fixed to one end of the backing plate 4 close to the backing plate 4 by screws, one end of the screw 7 is connected to the adaptor 6, the other end of the screw passes through the supporting block 3, and the two nuts 8 are respectively located at two ends of the supporting block 3 and are screwed with the screw 7;
during assembly, moving the equipment mandrel 1 to a part needing repair welding, sequentially bringing a box sealing circumferential weld friction stir welding local repair welding detachable inner support part into the box body through a flange at the bottom end of the box body according to an assembly sequence, fixing the mandrel 1 of the repair welding tool on the equipment mandrel, inserting the inner end of the central rod 2 into the T-shaped slot 10 from the end part of the lantern ring 9, connecting the backing plate 4 with the support block 3 by using a stud, adjusting the effective length of the stud to be shortest through the nut 8, connecting and screwing the outer end of the central rod 2 with the support block 3, assembling the four groups of support members and the support rods 5 in place, tightly holding an area to be welded by using an outer holding claw of circumferential weld equipment, sequentially adjusting the nut 8 on the stud, and enabling the backing plate 4 to tightly support a welding seam needing repair welding at the inner wall of the box body circumferential seal to be repaired welding, so far, completing the installation of the box sealing circumferential weld friction stir welding local repair welding detachable inner support;
step 2: repair welding;
starting circular seam friction stir welding equipment, and performing repair welding on a welding seam tightly supported by the backing plate 4 by a stirring pin on the equipment;
and step 3: demolishing repair welding product
And (3) removing the repair welding tool and the storage tank after repair welding, firstly rotating the nut 8, removing the tightening member, taking out the tightening member from the tank bottom flange, then taking out the support rod 5 and the tightening member from the tank bottom flange, finally removing the mandrel 1 of the repair welding tool from the equipment mandrel, withdrawing the operator from the storage tank, withdrawing the equipment mandrel from the storage tank, and removing the box body from the circular seam friction stir welding equipment to finish the repair welding work.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (7)
1. A box sealing circumferential weld repair welding method based on a back-pumping friction stir welding process is characterized by comprising the following steps:
step 1: assembling a product to be subjected to repair welding on annular seam friction stir welding equipment through a repair welding tool;
the repair welding tool comprises a mandrel, central rods, supporting blocks, a base plate and supporting rods, wherein the two central rods form a rod group, the inner end of the rod group is connected with the mandrel, one end of each supporting block is connected with the outer end of the rod group, and the other end of each supporting block is connected with the base plate through a connector to form a tensioning member; the plurality of bracing members are circumferentially arranged relative to the mandrel to form a disc-shaped inner bracing ring matched with the interior of a product to be repaired, and two ends of each bracing rod are respectively connected with two adjacent bracing blocks;
after assembly, the clamped product is fixed on a core shaft of circular seam friction stir welding equipment through a core shaft of a repair welding tool, and an adapter is adjusted to enable a base plate of a tightening member in an inner support ring to tighten a welding seam to be repaired and welded on the inner wall of the product to be welded;
step 2: repair welding;
starting circular seam friction stir welding equipment, and performing repair welding on a welding seam tightly supported by a backing plate by using a stirring pin on the equipment;
and step 3: demolishing repair welding product
And (4) removing the repair welding tool from the product after repair welding, removing a core shaft of the repair welding tool from a core shaft of the circular seam friction stir welding equipment, withdrawing the core shaft of the equipment, and removing the product after repair welding from the circular seam friction stir welding equipment to finish repair welding.
2. The box sealing circumferential weld repair welding method based on the pumpback friction stir welding process as claimed in claim 1, wherein the adapter comprises an adapter seat, a screw rod and a nut, the adapter seat is fixed on one end of the backing plate close to the supporting block through a screw, one end of the screw rod is connected with the adapter seat, the other end of the screw rod penetrates through the supporting block, and the two nuts are respectively located at two ends of the supporting block and are in threaded connection with the screw rod; in the step 1, the screw is rotated to drive the base plate to be away from the supporting block, and the welding line needing repair welding at the inner wall of a product to be welded is tightly supported while the distance between the base plate and the supporting block is increased; and in the step 3, after repair welding, the nut is rotated to enable the screw to drive the base plate to be close to the support block, the distance between the base plate and the support block is reduced, meanwhile, a weld joint at the position of the inner wall of a product to be welded is loosened after repair welding, the support member and the support rod are removed, then the support member and the support rod are taken out from a box body after repair welding, and finally, the core shaft of the repair welding tool is detached from the equipment core shaft.
3. The box sealing girth joint repair welding method based on the back suction friction stir welding process according to claim 1 or 2, wherein the backing plate is connected with the supporting block through three adapters.
4. The box sealing girth weld repair welding method based on the pumpback friction stir welding process as claimed in claim 1 or 2, wherein four groups of tightening members are uniformly distributed circumferentially relative to the mandrel to form a disk-shaped inner tightening ring.
5. The box sealing circumferential weld repair welding method based on the pumpback friction stir welding process according to claim 1 or 2, characterized in that a sleeve ring is fixedly arranged outside the mandrel, a T-shaped slot is arranged on the sleeve ring, the T-shaped slot axially extends to the end part penetrating through the sleeve ring, the inner end of the central rod is matched with the T-shaped slot, and the step 1 is to insert the inner end of the central rod into the T-shaped slot from the end part of the sleeve ring so as to connect the tightening member with the mandrel; and (3) after the repair welding in the step (3) is finished, detaching the central rod from the end part of the lantern ring, namely separating the central rod from the mandrel.
6. The box sealing circumferential weld repair welding method based on the pumpback friction stir welding process according to claim 5, wherein the mandrel is externally provided with an upper sleeve ring and a lower sleeve ring, the T-shaped slots on the upper sleeve ring and the lower sleeve ring respectively axially extend to the upper end and the lower end of the sleeve ring, one cushion block in the tightening member is respectively connected with the upper rod group and the lower rod group, and central rods of the upper rod group and the lower rod group are respectively matched with the T-shaped slots on the upper sleeve ring and the lower sleeve ring.
7. The box sealing girth weld repair welding method based on the back suction friction stir welding process according to claim 5 or 6, wherein the outer end of the central rod is in threaded connection with a support block.
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| CN202110650996.0A CN113210838B (en) | 2021-06-09 | 2021-06-09 | Box sealing circumferential weld repair welding method based on back-pumping friction stir welding process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114054932A (en) * | 2021-11-29 | 2022-02-18 | 天津航天长征火箭制造有限公司 | Vertical assembling method for butt joint annular seam of spherical crown box bottom and short shell |
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| CN113210838B (en) | 2022-11-29 |
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